Objective To inspect the rate of success of anastomosis and tissue damage with different power levels of photocoagulation in the treatment of experimental branch retinal vein occlusion (BRVO) by laser induced chorioretinal venous anastomosis.

There has been a great deal of interest in the use of the argon laser to produce chorioretinal venous anastomoses in the treatment of vision-threatening macular edema following central retinal vein occlusion.

We report a case of choroidovitreal neovascularization following laser-induced chorioretinal venous anastomosis formation in a patient with central retinal vein occlusion.

Many diseases may cause cystoid ma- cular edema(CME),which suggests that CME is not an independent disease,but a clinical sign and result caused by many diseases.We present 52 cases with cystoid macular edema and study the fluorecein angiograms,clinical observation and visual prognosis. These diseases were central retinal vein occlusion (50 cases),retinal angiomatosis(1 case),chorioretinitis (1 case),Fluorecein angiography showed abnormal perifoveal retinal capillary permeability,which formed a flower-petal pattern.There were 128 angiograms(97 cases)with central retinal vein occlu- sion.The incidence of CME was 51.55%(50 cases). The average follow-up period was 12 months.The visual acuity in 22% eyes with CME recovered to 0.6 or better,while 78.72% eyes with no CME recovered to 0.6 or better.Comparison between the two groups showed P<0.005.The results suggest that CME affects the visual prognosis apparently. 5 cases with histopathologic features of CME were examined.The cystoid spaces were seen in the outer plexiform layer,inner nuclear layer,inner plexiform layer,ganglion cell and nerve fibre layers. In severe cases,cystoid spaces were seen in every layer of the retina and extended from the optic disc to the equator.Simultaneously vessel occlusion,retinal pigment epithelial atrophy and retinal degeneration were seen,which suggest that CME not only affects visual acuity but also is the reason of poor visual acuity in some cases.

The posterior fundus changes in 104 patients (188 eyes) with high myopia (more than -6.00D) were studied. The results showed: posterior staphyloma was one of basic pathologic changes in the myopic fundus, with an incidence of 77.31%, which was classified into three types: macular, peripapillary, papillo-macular mixed. The choroidoretinal atrophy (CRA) included three stages:1) retinal pigment epithelium degeneration appeared; 2) choriocapillaris atrophied; 3) the atrophy of large choroidal vessels occurred. The...

The posterior fundus changes in 104 patients (188 eyes) with high myopia (more than -6.00D) were studied. The results showed: posterior staphyloma was one of basic pathologic changes in the myopic fundus, with an incidence of 77.31%, which was classified into three types: macular, peripapillary, papillo-macular mixed. The choroidoretinal atrophy (CRA) included three stages:1) retinal pigment epithelium degeneration appeared; 2) choriocapillaris atrophied; 3) the atrophy of large choroidal vessels occurred. The positive correlations were shown between the incidence of CRA and the increasing of axial length, advancing of myopic severity and the aging of the patients. Lacquer crack lesions was an important factor that led to macular haemorrhage and subretinal neovascularization, and a close relationship was found between the cracks and Fuchs' spot. The results indicated that posterior staphyloma was a main and early sign in the developing stage of the disease, and that the CRA was an important sign of the degenerative stage of high myopia. The patients' visual function steadily deteriorating due to the changes mentioned above.